Cock and valve



April 14, 1931. C 'D' 5 5 AL 1,800,243

COCK AND VALVE Filed Nov. 15, 1929 c d on v e T r h M i 1 I f U s L hm fn CYRIL DOUGLAS .BIRKS,

NORMAN ARTH R BIRK s,

aupww Patented Apr. 14, 1931 UNITED STATES PATENT OFFICE CYRIL DOUGLASBIRKS AND NORMAN ARTHUR BIRKS, OF LONDON, ENGLAND COCK AND VALVEApplication filed November 15, 1929.

This invention relates to piston release valves of the type which can beinstantaneously operated to permit air or the like, under pressure, tobe passed through them.

The object of the present invention is to provide a simple and eflicientconstruction of valve of this type.

A further object of the present invention is to provide an improvedvalve of this CYEQ for the purpose of cleansing, or removingobstructions from pipes, and for other purposes Where a sudden dischargeof compressed fluid is desired.

The accompanying drawing is a vertical section of one way of putting thepresent invention into practice.

Referring to the drawing, the device coinprises a barrel (2/. providedwith inlet I) and outlet 0. The inlet Z) is internally threaded toengage the outlet (Z from a compressor or other source of live air, andthe other end of the barrel on is threaded internally to engage a plug 0which closes this end of the barrel. A tube f flanged at its ends isdisposed inside the barrel (4 between the inlet Z) and the plug c, andis provided with perforations g about its medial portion. A leatherwasher h is placed between the one flanged end of the tube 7 and anabutment formed in the barrel 3 a; and a rubber washer 7c and fibrewasher 7 are placed between the other flanged end of the tube 7" and theplug Located within the tube t is a piston formed by a. cup leather 112.connected to a rod n which extends through the tube f and through aboring in the plug 0. The sides of the cup leather are held against theinner surface of the tube f by a spacing disc 0 held firmly against theleather by a spring 7) coiled around the screw q. The free end of therod 71, is restricted in diameter at 0', the restricted portion passingthrough a boring in the end cap 8 and engaging a nut t. The cap 8 isheld in position for holding the valve closed by bayonet joint 1).

In use, in order to pass compressed fluid through the device, the cap 8is released by being rotated, whereupon the piston m and rod a moveoutwards instantaneously under the action of the compressed air or thelike Serial No. 407,346.

entering through the inlet 7), uncovering the perforations g, throughwhich the charge of compressed air strean'ls on its way to the outlet c.

What we claim and desire to secure by Letis tors Patent is 1. Aninstantaneous piston release valve comprising a cylindrical casing, aninlet to the casing, an outlet from the casing, a tube disposed in thecasing in a fixed position relailii tively to the casing, perforationsin the tube between the inletand the outlet, a plug closing one end ofthe casing, a boring in the plug, a piston comprising'a cup leatherfixed to a piston rod, said piston slidably mounted 1' within the saidtube and normally shutting off communication between the inlet and saidperforations, and said rod slidable in said boring, an end cap securedto the piston rod and a bayonet joint between the end cap and 7a thecasing adapted to releasably hold the valve in closed position.

2. A valve according to claim 1, further comprising packings suitablydisposed between the inlet and the perforations in the 7 tube to make anairtight joint when the piston is held in its operative position.

In testimony whereof, we aflix our sigmtures.

CYRIL DOUGLAS BIRKS. ro NORMAN ARTHUR BIRKS.

tail

loo

